forked from MapComplete/MapComplete
84 lines
No EOL
3.4 KiB
TypeScript
84 lines
No EOL
3.4 KiB
TypeScript
/**
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* Applies geometry changes from 'Changes' onto every feature of a featureSource
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*/
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import {Changes} from "../../Osm/Changes";
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import {UIEventSource} from "../../UIEventSource";
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import {FeatureSourceForLayer, IndexedFeatureSource} from "../FeatureSource";
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import FilteredLayer from "../../../Models/FilteredLayer";
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import {ChangeDescription, ChangeDescriptionTools} from "../../Osm/Actions/ChangeDescription";
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export default class ChangeGeometryApplicator implements FeatureSourceForLayer {
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public readonly features: UIEventSource<{ feature: any; freshness: Date }[]> = new UIEventSource<{ feature: any; freshness: Date }[]>([]);
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public readonly name: string;
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public readonly layer: FilteredLayer
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private readonly source: IndexedFeatureSource;
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private readonly changes: Changes;
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constructor(source: (IndexedFeatureSource & FeatureSourceForLayer), changes: Changes) {
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this.source = source;
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this.changes = changes;
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this.layer = source.layer
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this.name = "ChangesApplied(" + source.name + ")"
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this.features = new UIEventSource<{ feature: any; freshness: Date }[]>(undefined)
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const self = this;
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source.features.addCallbackAndRunD(_ => self.update())
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changes.allChanges.addCallbackAndRunD(_ => self.update())
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}
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private update() {
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const upstreamFeatures = this.source.features.data
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const upstreamIds = this.source.containedIds.data
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const changesToApply = this.changes.allChanges.data
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?.filter(ch =>
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// Does upsteram have this element? If not, we skip
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upstreamIds.has(ch.type + "/" + ch.id) &&
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// Are any (geometry) changes defined?
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ch.changes !== undefined &&
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// Ignore new elements, they are handled by the NewGeometryFromChangesFeatureSource
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ch.id > 0)
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if (changesToApply === undefined || changesToApply.length === 0) {
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// No changes to apply!
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// Pass the original feature and lets continue our day
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this.features.setData(upstreamFeatures);
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return;
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}
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const changesPerId = new Map<string, ChangeDescription[]>()
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for (const ch of changesToApply) {
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const key = ch.type + "/" + ch.id
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if (changesPerId.has(key)) {
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changesPerId.get(key).push(ch)
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} else {
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changesPerId.set(key, [ch])
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}
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}
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const newFeatures: { feature: any, freshness: Date }[] = []
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for (const feature of upstreamFeatures) {
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const changesForFeature = changesPerId.get(feature.feature.properties.id)
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if (changesForFeature === undefined) {
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// No changes for this element
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newFeatures.push(feature)
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continue;
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}
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// Allright! We have a feature to rewrite!
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const copy = {
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...feature
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}
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// We only apply the last change as that one'll have the latest geometry
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const change = changesForFeature[changesForFeature.length - 1]
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copy.feature.geometry = ChangeDescriptionTools.getGeojsonGeometry(change)
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console.log("Applying a geometry change onto:", feature,"The change is:", change,"which becomes:", copy)
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newFeatures.push(copy)
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}
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this.features.setData(newFeatures)
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}
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} |